System of hollow-wall construction of concrete blocks.



' B. J. D. BLAOKMORE. SYSTEM OF HOLLOW WALL CONSTRUCTION OF CONCRETE BLOCKS.

' APPLICATION FILED AUG. 23, 1911.

1 084 389 Patented Jan. 13, 1914.

INVENTUH ATTORNEY BERNARD J D. BEACKMORE, 0F MILWAUKEE, WISCONSIN.

SYSTEM OF HOLLOW-WALL CONSTRUCTION OF CONCRETE BLOCKS.

Specification of Letters Patent.

Application filed August 23, 1911. Serial No. 645,618.

To all whom it may concern:

Be it known that I, BERNARD J. D. BLACK- MORE, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented a new and useful System of Hollow-Wall Con: struction of Concrete Blocks, of which the following is a specification.

My invention relates to hollow wall construction of concrete blocks and the objects of my improvement are to provide a hollow wall without any connecting bridges of concrete and to still have the two parts of the wall tied and braced together; to make the blocks similar so that the same block may be used in either part of the double wall by turning it end for end; and to provide reinforcing for each part of the wall so that less concrete may be employed without impairing its strength and solidity. T attain these results bythe devices illustrated in the accompanying drawing in which Figure 1 shows a pair of blocks wit-h their binding rods in proper relation, Fig. 2 shows a modification in which the vertical rods are dispensed with, and Fig. 3 shows a further modified form in which only the tie pieces are used.

In Fig. 1, a and 6 represent concrete blocks forming portions of the inside and outside wall respectively. These blocks are exactly similar in all features of form and size so that the same block may be used oneither the inside or outside wall. blocks for the outside wall may be given a brick, glazed tile, rock or other suitable surface, and the blocks for the inside wall may be given a glazed tile or other ornamental (Z (Z becomesolidly embedded in mortar and. form a longitudinal horizontal tie holding all the blocks of each course in each wall together.

Midway of the length of each block avertical groove 6 is formed on the air space side of each block. The same block may therefore be used in either one of the pair of walls If desired the by placing it with the groove 0 on top and the groove 6 opening into the air space.

Vertical rods f are placed in the grooves 6 with the rods (Z between them and the air space, and these vertical rods are tied together and spaced apart at the same time by the cross ties g which have their ends twisted around the vertical rods f. The grooves 6 may be practically filled with mortar in each course as the wall is built before the cross ties are placed. The cross ties may be manufactured separately and slipped over the vertical rods f and lowered into posit-ion as needed, or they may be twisted on the vertical rods bymeans of a hand tool when in their permanent position. The result of this construction is a pair of walls with a perfect air space between them, each wall being reinforced by horizontal and vertical tie rods, and both walls being tied together and spaced apart by the cross ties. If in any portion of the wall it is deemed desirable to make provision for a sliding door, window sash, or other movable panel, the cross ties may be omitted in that portion of the wall, which portion will still be tied to the rest of the wall by the horizontal and vertical rods.

In the form. shown in Fig. 2 the block is the same as in Fig.1 save that the transversegroove e is formed by filling part of the vertical groove of Fig. 1. In the wall formed as shown in Fig. 2 the vertical rods are omitted and the cross ties are secured to the horizontal rods.

In the form shown in Fig. 3 both vertical and horizontal rods are dispensed with and the cross ties only are retained. In this form particularly the distance the blocks are Patented Jan. 13, 1914..

apart may be readily varied for any purpose,

as for instance to allow room between them for a chimney flue, or to allow the wall ,to be corbeled, and the two parts of the wall will still be secured together. Also, by placing half grooves in the top and bot-tom as shown, the vertical courses will be bound togetherto some extent without the vertical rods.

What I claim as my invention is- In a hollow wall construction, two walls of building blocks each of which blocks has .registering grooves in the abutting faces of the blocks extending longitudinally of said blocks, reinforcing rods embedded in said grooves extending along each course of'- blocks, each block having a transverse groove necting the transverse rods of one wall with therein intersecting said longitudinal grooves, those of the other across the intervening said transverse grooves adapted to register space between the Walls.

with each other in the successive courses, rev BERNARD J. D. BLACKMORE. inforoing rods in said transverse grooves eX- Witnesses: tending' between the bottoms of the grooves ALBERT E. SMITH, i

and the longitudinal rod, and tie rods con- E. O. MANKTELOW. 

